Here is what I do instead. Configure a second virtual hard disk for the pagefile and for %TEMP% while making the second disk an independent non-persistent disk directly after partitioning/formatting but before you set the pagefile and %TEMP% to it. Then always pass along the complete Virtual Machine! By setting the second disk as independent non-persistent it's initial size is negligible and always reverts to an empty disk when the VM is shutdown however if/when necessary it survives a reboot or suspension and is not needlessly included when taking Snapshots. IMO it's the professional way to do what you're wanting to do!
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